How much is Sun Minglang's calligraphy per square foot?

The conversion between 33.3 cm× 33.3 cm. ft and common meters and centimeters is: one meter equals three feet, and 1 ft equals 33.33 cm. A horizontal ruler of Sun Minglang's calligraphy is 33.3cm×33.3cm, and the ruler is one of the units of measurement used in ancient China. One foot is the unit of length, and ten inches is one foot.